Year	current US$
1975	976.334228515625
1976	1157.41162109375
1977	1476.271484375
1978	1929.40356445313
1979	2559.259765625
1980	4232.02294921875
1981	4033.24047851563
1982	4122.78466796875
1983	4091.04858398438
1984	4258.74365234375
1985	4488.287109375
1986	5642.63134765625
1987	6690.578125
1988	7645.6298828125
1989	8038.9140625
1990	9641.5751953125
1991	9696.099609375
1992	11310.072265625
1993	10526.1416015625
1994	11617.6923828125
1995	15261.41015625
1996	15139.2265625
1997	14234.244140625
1998	15092.826171875
1999	15287.9189453125
2000	14388.34765625
2001	14821.447265625
2002	16093.21484375
2003	20252.23828125
2004	23792.62109375
2005	24959.259765625
2006	26729.32421875
2007	31244.92578125
2008	35397.36328125
2009	32236.53515625
2010	31105.02734375
2011	32485.802734375
2012	28991.9296875
2013	27797.453125
2014	27244.34375
2015	23487.21875
2016	24715.142578125
2017	26697.005859375
2018	29419.88671875
2019	29419.9921875
2020	28281.412109375
2021	32745.83984375
2022	32048.248046875
2023	34701.44140625